Asylum wrote:A GT would have a spoiler, crosslaced wheels and body colored mirrors.

But at this point it likely wouldn't affect the price much.

Those things didn't come into play until '91 along with the body color grille.

88 GTs would have 14" wheels standard, the 15" dark argent steel wheels with stainless center cap and trim ring were in fact a part of the Z51 package. in '89 and '90 the GT was standard with the same wheel as the Z51, just in light argent; crosslace wheels were optional. No spoiler was on the GT until 90, but a luggage rack was optional on the older years. 1990 was also the only year the GT was available with 2-tone paint.